refactor(reader): remove test font, move settings panel to right sidebar

- Remove Playwrite NZ Guides test font and all references (FONT_MAP,
  FONT_FILES, reader-fonts.css, dropdown option, font files)
- Move settings panel from left sidebar to right sidebar (left sidebar
  now only contains TOC)
- Move Restore Defaults button from top bar icon to a styled button
  inside the settings panel, side by side with Done button

web/src/reader/reader.ts

@@ -12,7 +12,6 @@ const FONT_MAP: Record<string, string> = {
   "noto-serif": '"Noto Serif"',
   "charis-sil": '"Charis SIL"',
   "ibm-plex": '"IBM Plex Serif"',
-  "playwrite": '"Playwrite NZ Guides"',
 };
 
 interface FontFile {
@@ -45,7 +44,6 @@ const FONT_FILES: FontFile[] = [
   { family: '"IBM Plex Serif"', url: "/static/fonts/ibm-plex/IBMPlexSerif-Bold.woff2", weight: "700", style: "normal" },
   { family: '"IBM Plex Serif"', url: "/static/fonts/ibm-plex/IBMPlexSerif-Italic.woff2", weight: "400", style: "italic" },
   { family: '"IBM Plex Serif"', url: "/static/fonts/ibm-plex/IBMPlexSerif-BoldItalic.woff2", weight: "700", style: "italic" },
-  { family: '"Playwrite NZ Guides"', url: "/static/fonts/Playwrite_NZ_Guides/PlaywriteNZGuides-Regular.woff2", weight: "400", style: "normal" },
 ];
 
 let fontBlobUrls: Record<string, string> = {};